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first shot for a libinfnoise approach

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This commit is contained in:
Manuel Domke
2018-04-15 23:50:03 +02:00
parent d73dd31b32
commit 608461cd57
7 changed files with 562 additions and 276 deletions
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259
software/infnoise.c
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@@ -3,9 +3,6 @@
// Required to include clock_gettime
#define _POSIX_C_SOURCE 200809L
#define INFNOISE_VENDOR_ID 0x0403
#define INFNOISE_PRODUCT_ID 0x6015
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
@@ -13,224 +10,9 @@
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <ftdi.h>
#include "infnoise.h"
#include "libinfnoise.h"
#include "KeccakF-1600-interface.h"
// Extract the INM output from the data received. Basically, either COMP1 or COMP2
// changes, not both, so alternate reading bits from them. We get 1 INM bit of output
// per byte read. Feed bits from the INM to the health checker. Return the expected
// bits of entropy.
static uint32_t extractBytes(uint8_t *bytes, uint8_t *inBuf) {
inmClearEntropyLevel();
uint32_t i;
for(i = 0u; i < BUFLEN/8u; i++) {
uint32_t j;
uint8_t byte = 0u;
for(j = 0u; j < 8u; j++) {
uint8_t val = inBuf[i*8u + j];
uint8_t evenBit = (val >> COMP2) & 1u;
uint8_t oddBit = (val >> COMP1) & 1u;
bool even = j & 1u; // Use the even bit if j is odd
uint8_t bit = even? evenBit : oddBit;
byte = (byte << 1u) | bit;
// This is a good place to feed the bit from the INM to the health checker.
if(!inmHealthCheckAddBit(evenBit, oddBit, even)) {
fputs("Health check of Infinite Noise Multiplier failed!\n", stderr);
exit(1);
}
}
bytes[i] = byte;
}
return inmGetEntropyLevel();
}
// Write the bytes to either stdout, or /dev/random.
static void outputBytes(uint8_t *bytes, uint32_t length, uint32_t entropy, struct opt_struct *opts) {
if(!opts->devRandom) {
if(fwrite(bytes, 1, length, stdout) != length) {
fputs("Unable to write output from Infinite Noise Multiplier\n", stderr);
exit(1);
}
} else {
inmWaitForPoolToHaveRoom();
inmWriteEntropyToPool(bytes, length, entropy);
}
}
// Whiten the output, if requested, with a Keccak sponge. Output bytes only if the health
// checker says it's OK. Using outputMultiplier > 1 is a nice way to generate a lot more
// cryptographically secure pseudo-random data than the INM generates. If
// outputMultiplier is 0, we output only as many bits as we measure in entropy.
// This allows a user to generate hundreds of MiB per second if needed, for use
// as cryptogrpahic keys.
static uint32_t processBytes(uint8_t *keccakState, uint8_t *bytes, uint32_t entropy, struct opt_struct* opts) {
//Use the lower of the measured entropy and the provable lower bound on
//average entropy.
if(entropy > inmExpectedEntropyPerBit*BUFLEN/INM_ACCURACY) {
entropy = inmExpectedEntropyPerBit*BUFLEN/INM_ACCURACY;
}
if(opts->raw) {
// In raw mode, we just output raw data from the INM.
outputBytes(bytes, BUFLEN/8u, entropy, opts);
return BUFLEN/8u;
}
// Note that BUFLEN has to be less than 1600 by enough to make the sponge secure,
// since outputing all 1600 bits would tell an attacker the Keccak state, allowing
// him to predict any further output, when outputMultiplier > 1, until the next call
// to processBytes. All 512 bits are absorbed before sqeezing data out to insure that
// we instantly recover (reseed) from a state compromise, which is when an attacker
// gets a snapshot of the keccak state. BUFLEN must be a multiple of 64, since
// Keccak-1600 uses 64-bit "lanes".
KeccakAbsorb(keccakState, bytes, BUFLEN/64u);
uint8_t dataOut[16u*8u];
if(opts->outputMultiplier == 0u) {
// Output all the bytes of entropy we have
KeccakExtract(keccakState, dataOut, (entropy + 63u)/64u);
outputBytes(dataOut, entropy/8u, entropy & 0x7u, opts);
return entropy/8u;
}
// Output 256*outputMultipler bytes.
uint32_t numBits = opts->outputMultiplier*256u;
uint32_t bytesWritten = 0u;
while(numBits > 0u) {
// Write up to 1024 bits at a time.
uint32_t bytesToWrite = 1024u/8u;
if(bytesToWrite > numBits/8u) {
bytesToWrite = numBits/8u;
}
KeccakExtract(keccakState, dataOut, bytesToWrite/8u);
uint32_t entropyThisTime = entropy;
if(entropyThisTime > 8u*bytesToWrite) {
entropyThisTime = 8u*bytesToWrite;
}
outputBytes(dataOut, bytesToWrite, entropyThisTime, opts);
bytesWritten += bytesToWrite;
numBits -= bytesToWrite*8u;
entropy -= entropyThisTime;
if(numBits > 0u) {
KeccakPermutation(keccakState);
}
}
if(bytesWritten != opts->outputMultiplier*(256u/8u)) {
fprintf(stderr, "Internal error outputing bytes\n");
exit(1);
}
return bytesWritten;
}
// Return a list of all infinite noise multipliers found.
static bool listUSBDevices(struct ftdi_context *ftdic) {
ftdi_init(ftdic);
struct ftdi_device_list *devlist;
struct ftdi_device_list *curdev;
char manufacturer[128], description[128], serial[128];
int i=0;
// search devices
int rc = ftdi_usb_find_all(ftdic, &devlist, INFNOISE_VENDOR_ID, INFNOISE_PRODUCT_ID);
if (rc < 0) {
if (!isSuperUser()) {
fprintf(stderr, "Can't find Infinite Noise Multiplier. Try running as super user?\n");
} else {
fprintf(stderr, "Can't find Infinite Noise Multiplier\n");
}
}
for (curdev = devlist; curdev != NULL; i++) {
printf("Device: %d, ", i);
rc = ftdi_usb_get_strings(ftdic, curdev->dev, manufacturer, 128, description, 128, serial, 128);
if (rc < 0) {
if (!isSuperUser()) {
fprintf(stderr, "Can't find Infinite Noise Multiplier. Try running as super user?\n");
}
fprintf(stderr, "ftdi_usb_get_strings failed: %d (%s)\n", rc, ftdi_get_error_string(ftdic));
return false;
}
printf("Manufacturer: %s, Description: %s, Serial: %s\n", manufacturer, description, serial);
curdev = curdev->next;
}
return true;
}
// Initialize the Infinite Noise Multiplier USB interface.
static bool initializeUSB(struct ftdi_context *ftdic, char **message, char *serial) {
ftdi_init(ftdic);
struct ftdi_device_list *devlist;
// search devices
int rc = 0;
if ((rc = ftdi_usb_find_all(ftdic, &devlist, INFNOISE_VENDOR_ID, INFNOISE_PRODUCT_ID)) < 0) {
*message = "Can't find Infinite Noise Multiplier\n";
return false;
}
// only one found, or no serial given
if (rc >= 0) {
if (serial == NULL) {
// more than one found AND no serial given
if (rc >= 2) {
fprintf(stderr,"Multiple Infnoise TRNGs found and serial not specified, using the first one!\n");
}
if (ftdi_usb_open(ftdic, INFNOISE_VENDOR_ID, INFNOISE_PRODUCT_ID) < 0) {
if(!isSuperUser()) {
*message = "Can't open Infinite Noise Multiplier. Try running as super user?\n";
} else {
*message = "Can't open Infinite Noise Multiplier\n";
}
return false;
}
} else {
// serial specified
rc = ftdi_usb_open_desc(ftdic, INFNOISE_VENDOR_ID, INFNOISE_PRODUCT_ID, NULL, serial);
if (rc < 0) {
if(!isSuperUser()) {
*message = "Can't find Infinite Noise Multiplier. Try running as super user?\n";
} else {
*message = "Can't find Infinite Noise Multiplier with given serial\n";
}
return false;
}
}
}
// Set high baud rate
rc = ftdi_set_baudrate(ftdic, 30000);
if(rc == -1) {
*message = "Invalid baud rate\n";
return false;
} else if(rc == -2) {
*message = "Setting baud rate failed\n";
return false;
} else if(rc == -3) {
*message = "Infinite Noise Multiplier unavailable\n";
return false;
}
rc = ftdi_set_bitmode(ftdic, MASK, BITMODE_SYNCBB);
if(rc == -1) {
*message = "Can't enable bit-bang mode\n";
return false;
} else if(rc == -2) {
*message = "Infinite Noise Multiplier unavailable\n";
return false;
}
// Just test to see that we can write and read.
uint8_t buf[64u] = {0u,};
if(ftdi_write_data(ftdic, buf, 64) != 64) {
*message = "USB write failed\n";
return false;
}
if(ftdi_read_data(ftdic, buf, 64) != 64) {
*message = "USB read failed\n";
return false;
}
return true;
}
static void initOpts(struct opt_struct *opts) {
opts->outputMultiplier = 0u;
opts->daemon =
@@ -246,13 +28,6 @@ static void initOpts(struct opt_struct *opts) {
opts->serial = NULL;
}
// Return the differnece in the times as a double in microseconds.
static double diffTime(struct timespec *start, struct timespec *end) {
uint32_t seconds = end->tv_sec - start->tv_sec;
int32_t nanoseconds = end->tv_nsec - start->tv_nsec;
return seconds*1.0e6 + nanoseconds/1000.0;
}
int main(int argc, char **argv)
{
struct ftdi_context ftdic;
@@ -331,7 +106,6 @@ int main(int argc, char **argv)
}
}
// read environment variables, not overriding command line options
if (opts.serial == NULL) {
if (getenv("INFNOISE_SERIAL") != NULL) {
@@ -367,31 +141,44 @@ int main(int argc, char **argv)
printf("GIT VERSION - %s\n", GIT_VERSION);
printf("GIT COMMIT - %s\n", GIT_COMMIT);
printf("GIT DATE - %s\n", GIT_DATE);
printf("BUILD DATE - %s\n", BUILD_DATE);
return 0;
}
char *message;
if (opts.listDevices) {
listUSBDevices(&ftdic);
struct inm_devlist *device_list;
device_list = malloc(sizeof(struct inm_devlist));
if(!listUSBDevices(&ftdic, &device_list, &message)) {
fputs(message, stderr);
return 1;
}
struct inm_devlist_node *tmp;
for ( tmp = device_list->head; tmp != NULL; tmp=tmp->next) {
if (tmp->device->serial != NULL) {
printf("%s\n", tmp->device->serial);
}
//tmp = tmp->next;
}
return 0;
}
// Optionally run in the background and optionally write a PID-file
startDaemon(&opts);
if(opts.devRandom) {
inmWriteEntropyStart(BUFLEN/8u, &opts);
if (opts.devRandom) {
inmWriteEntropyStart(BUFLEN/8u, opts.debug);
}
if(!inmHealthCheckStart(PREDICTION_BITS, DESIGN_K, &opts)) {
fputs("Can't intialize health checker\n", stderr);
if (!inmHealthCheckStart(PREDICTION_BITS, DESIGN_K, opts.debug)) {
fputs("Can't initialize health checker\n", stderr);
return 1;
}
KeccakInitialize();
uint8_t keccakState[KeccakPermutationSizeInBytes];
KeccakInitializeState(keccakState);
char *message;
if(!initializeUSB(&ftdic, &message, opts.serial)) {
// Sometimes have to do it twice - not sure why
if(!initializeUSB(&ftdic, &message, opts.serial)) {
@@ -429,7 +216,9 @@ int main(int argc, char **argv)
uint32_t entropy = extractBytes(bytes, inBuf);
if(!opts.noOutput && inmHealthCheckOkToUseData() && inmEntropyOnTarget(entropy, BUFLEN)) {
uint64_t prevTotalBytesWritten = totalBytesWritten;
totalBytesWritten += processBytes(keccakState, bytes, entropy, &opts);
totalBytesWritten += processBytes(keccakState, bytes, NULL, entropy, opts.raw,
opts.devRandom, opts.outputMultiplier, opts.noOutput);
if(opts.debug && (1u << 20u)*(totalBytesWritten/(1u << 20u)) > (1u << 20u)*(prevTotalBytesWritten/(1u << 20u))) {
fprintf(stderr, "Output %lu bytes\n", (unsigned long)totalBytesWritten);
}